DEDelaware Geography

Geography overview

Delaware occupies the 49th largest area among US states. Located in the Northeast region, specifically the mid atlantic subregion, its physical geography reflects its position on the North American continent. It has coastline on the atlantic.

Geographers typically think about a state's geography in five dimensions: location (where it is relative to other places), place (the physical and human characteristics), region (how it groups with others), movement (the flow of people, goods, and ideas), and human-environment interaction (how people have shaped and been shaped by the environment). This page touches on all five.

Topography and landforms

Delaware is geographically varied. From its elevation range to its river systems and forests, the state offers diverse landscapes.

Topography refers to the physical features of the land — mountains, valleys, plains, plateaus, basins. Delaware's topography was shaped over millions of years by tectonic activity, glaciation, erosion, river systems, and (in some regions) volcanic activity. Understanding the topography helps explain everything from where cities developed historically (typically near reliable water sources and navigable rivers) to modern climate patterns (mountains create rain shadows, for instance).

Rivers and waterways

The state has Atlantic Ocean coastline, with associated bays, estuaries, salt marshes, and barrier islands.

Mountains, elevation, and relief

Delaware has very low elevation — much of the state lies at or near sea level. This affects everything from climate (low elevations are typically warmer and more humid than high elevations) to flood risk to where development can occur.

Climate and time zone

Delaware observes Eastern Time.

National parks and protected areas

The National Park Service manages many sites in Delaware — national parks, national monuments, national forests, national wildlife refuges, and historic sites. Outdoor recreation drives significant visitor activity — hiking, camping, hunting, fishing, and wildlife viewing.

Wildlife and biodiversity

Delaware's wildlife reflects its geography. Forests, plains, rivers, and (where applicable) coasts support a wide range of mammals, birds, fish, reptiles, and amphibians. Protected populations of native species are maintained through state and federal wildlife management agencies. State parks and refuges protect critical habitats; hunting and fishing license fees fund much of the wildlife conservation work.

Climate zones within the state

Even within Delaware's small area, microclimates vary by elevation and terrain. Coastal regions (where applicable) typically have milder, more humid climates than interior areas. Mountain regions are colder and snowier. Desert regions are hot and dry.

Geology — what made Delaware the way it is

Delaware's present-day geography is the result of geological processes operating over hundreds of millions of years: plate tectonics, volcanic activity, glaciation, erosion, sedimentation. Most of the state's bedrock is sedimentary (limestone, sandstone, shale) or metamorphic (where heat and pressure transformed older rocks), with igneous rocks (granite, basalt) more common in mountainous areas. The last Ice Age (which ended approximately 11,000 years ago) reshaped much of the northern US and shaped lake basins, river valleys, and soil distribution.

Delaware notable firsts

• First state to ratify the US Constitution (December 7, 1787)
• One of the 13 original colonies

Delaware vs similar states

How does Delaware compare with 3 other states in the same region and size category?

State	Capital	Pop	Area rank	Admitted
Delaware	Dover	1 to 5 million	#49	1787
Connecticut	Hartford	1 to 5 million	#48	1788
Maine	Augusta	1 to 5 million	#39	1820
Maryland	Annapolis	5 to 10 million	#42	1788

Bordering states (3)

Delaware shares borders with 3 other US states, listed alphabetically below. Each link goes to the dedicated state page.

Similar states to Delaware

If this page interested you, you may also want to explore states with similar geography, history, or culture. These states share Delaware's region (Northeast) and similar size category:

Explore further