Jameson Land is a peninsula

Peninsula

A peninsula is a piece of land that is bordered by water on three sides but connected to mainland. In many Germanic and Celtic languages and also in Baltic, Slavic and Hungarian, peninsulas are called "half-islands"....

 in eastern Greenland

Greenland

Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...

, bounded to the southwest by Scoresby Sund

Scoresby Sund

Scoresby Sund is an inlet system of the Greenland Sea on the eastern coast of Greenland. It has a tree-like structure, with a main body approximately long that branches into a system of fjords covering an area of about . The longest of these extends 340–350 km in from the coastline...

 (the world's largest fjord

Fjord

Geologically, a fjord is a long, narrow inlet with steep sides or cliffs, created in a valley carved by glacial activity.-Formation:A fjord is formed when a glacier cuts a U-shaped valley by abrasion of the surrounding bedrock. Glacial melting is accompanied by rebound of Earth's crust as the ice...

), to the northwest by the Greenlandic mainland, to the north by Scoresby Land, and to the east by Carlsberg Fjord, Liverpool Land

Liverpool Land

Liverpool Land is a peninsula in eastern Greenland.- Geography :The peninsula is bounded by Scoresby Sund in the south, Carlsberg Fjord in the northwest, Kangerterajiva in the southwest, the Greenland Sea in the east, and Jameson Land in the west...

 and Hurry Inlet.

Geology

Jameson Land mainly consists of a tilted peneplain

Peneplain

A peneplain is a low-relief plain representing the final stage of fluvial erosion during times of extended tectonic stability. The existence of peneplains, and peneplanation as a geomorphological process, is not without controversy, due to a lack of contemporary examples and uncertainty in...

 of jurassic

Jurassic

The Jurassic is a geologic period and system that extends from about Mya to  Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

 sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

, highest in the east. In the northern end there are also rocks of triassic

Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

origin.