---
title: "Marginal Locations — AP Human Geography Definition"
description: "Marginal locations are hazardous, low-value sites (steep slopes, floodplains) where informal settlements form. Key to Latin American city models in AP HUG Unit 6."
canonical: "https://fiveable.me/ap-hug/key-terms/marginal-locations"
type: "key-term"
subject: "AP Human Geography"
unit: "Unit 6"
---

# Marginal Locations — AP Human Geography Definition

## Definition

In AP Human Geography, marginal locations are areas with unfavorable or risky physical traits, like steep hillsides, riverbanks, swamps, or polluted land, that the formal housing market skips over, so they often fill up with informal or squatter settlements, especially in cities of developing countries.

## What It Is

Marginal locations are the leftover spaces of a city. Think of land nobody with money wants to build on because it's dangerous, unstable, or unpleasant. Steep hillsides that can collapse in mudslides, riverbanks and floodplains that flood, swampy ground, land next to landfills or polluted industrial sites. Because formal developers and banks avoid these spots, they sit cheap or effectively free, and that's exactly why they matter in urban geography.

In [Topic 6.5](/ap-hug/unit-6/internal-structure-cities/study-guide/bmmlitd92K8BXI98qRxQ "fv-autolink"), marginal locations show up inside city models drawn from Latin America, Southeast Asia, and Africa (EK PSO-6.D.1). In rapidly urbanizing cities, rural migrants arrive faster than formal housing can absorb them, so they self-build on whatever land is unclaimed. That land is almost always marginal. The result is [squatter settlements](/ap-hug/key-terms/squatter-settlements "fv-autolink") perched on hazard-prone ground, like the disamenity sectors in the Latin American city model. The pattern flips the North American assumption that the urban poor live in the inner city; in many developing-world cities, the poorest residents live on the most physically dangerous edges.

## Why It Matters

Marginal locations live in **[Unit 6](/ap-hug/unit-6 "fv-autolink"): Cities and Urban Land-Use Patterns and Processes**, specifically Topic 6.5 (The Internal Structure of Cities). The term supports learning objective **6.5.A**, which asks you to explain the internal structure of cities using models and theories, including urban models from Latin America, Southeast Asia, and Africa. You can't fully explain those models without marginal locations, because they answer the 'why there?' question for squatter settlements and disamenity zones. The concept also reinforces bid-rent logic from the same EK. If desirable land goes to whoever can pay most, hazardous land goes to whoever can pay least, which is often nothing at all. That's spatial sorting by wealth, a [core](/ap-hug/key-terms/core "fv-autolink") idea the whole unit builds on.

## Connections

### Latin American City Model and Disamenity Zones (Unit 6)

The [Latin American city model](/ap-hug/key-terms/latin-american-city-model "fv-autolink")'s disamenity sectors are basically marginal locations drawn onto a map. Squatter settlements (favelas, barrios) cluster along steep slopes and ravines cutting through the city because that's the land the formal market left behind.

### [Bid-Rent Theory (Unit 6)](/ap-hug/key-terms/bid-rent-theory)

[Bid-rent theory](/ap-hug/key-terms/bid-rent-theory "fv-autolink") says land goes to the highest bidder, with prices peaking at the CBD. Marginal locations are the bottom of that auction. Nobody bids on a flood-prone riverbank, so the people with zero purchasing power end up there. Same logic, opposite end of the curve.

### [African City Model (Unit 6)](/ap-hug/key-terms/african-city-model)

Like the Latin American model, the [African city model](/ap-hug/key-terms/african-city-model "fv-autolink") places informal satellite settlements on the urban periphery, often on land with poor infrastructure and physical hazards. Marginal locations explain why those settlements sit where they do.

### Developing Countries and Rapid Urbanization (Units 6-7)

Marginal locations fill up fastest where [rural-to-urban migration](/ap-hug/key-terms/rural-to-urban-migration "fv-autolink") outpaces formal housing construction, which is the signature of cities in developing countries. This links the physical geography of a city to the development patterns you study across Units 6 and 7.

## On the AP Exam

No released FRQ has used the phrase 'marginal locations' verbatim, but the concept is baked into questions about city models in developing countries. A multiple-choice stem might describe a squatter settlement on a steep hillside outside Rio or Lagos and ask why it formed there, and 'marginal location' is the reasoning behind the right answer. On an FRQ about the internal structure of cities, you can earn points by explaining that informal settlements occupy hazard-prone, low-value land the formal market avoids. The move that scores is connecting the physical trait (flood risk, slope instability) to the economic logic (no formal demand, so informal settlement fills the gap).

## marginal locations vs Disamenity zones

These overlap but aren't identical. A marginal location is defined by its physical characteristics, like steep slopes, floodplains, or pollution, that make formal development impractical. A disamenity zone is a feature of the Latin American city model, describing the poorest areas of the city that often lack city services and may be controlled by gangs. Disamenity zones usually sit ON marginal locations, but 'marginal location' describes the land itself, while 'disamenity zone' describes the social and economic conditions of the settlement built there.

## Key Takeaways

- Marginal locations are physically risky or undesirable sites, like steep hillsides, riverbanks, swamps, and polluted zones, that the formal housing market avoids.
- Because this land is cheap or unclaimed, marginal locations are where squatter and informal settlements typically form in cities of developing countries.
- The concept supports learning objective 6.5.A by explaining where the poor live in urban models drawn from Latin America, Southeast Asia, and Africa.
- Marginal locations are the bottom of the bid-rent curve, since whoever can pay the least ends up on the land worth the least.
- In the Latin American city model, disamenity zones occupy marginal locations, which reverses the North American pattern where the poor concentrate near the inner city.

## FAQs

### What are marginal locations in AP Human Geography?

Marginal locations are areas with unfavorable physical characteristics, like steep hillsides, floodplains, swamps, or polluted zones, that are unsuitable for formal development. In Topic 6.5, they explain where squatter settlements form in cities of developing countries.

### Are marginal locations the same as disamenity zones?

Not quite. Marginal locations describe the hazardous land itself, while disamenity zones are the underserved, often dangerous neighborhoods in the Latin American city model that get built on that land. Disamenity zones sit on marginal locations, but the terms point at different things.

### Why do squatter settlements form in marginal locations?

Because the land is essentially free. Formal developers and buyers avoid hazard-prone sites, so rural migrants arriving in fast-growing cities self-build there since no one else claims the land. Bid-rent logic explains it: lowest demand land goes to those with the least to spend.

### Do rich people ever live in marginal locations?

Generally no, and that's the point. Wealthier residents in Latin American cities cluster along the commercial spine extending from the CBD, while marginal locations like steep slopes and floodplains house the urban poor in informal settlements.

### Is 'marginal locations' on the AP Human Geography exam?

It supports Topic 6.5 and learning objective 6.5.A on the internal structure of cities. You're most likely to need it when explaining the Latin American, Southeast Asian, or African city models, especially why informal settlements occupy hazardous peripheral land.

## Related Study Guides

- [6.5 The Internal Structure of Cities](/ap-hug/unit-6/internal-structure-cities/study-guide/bmmlitd92K8BXI98qRxQ)

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