Cape
A small extension of land is often referred to as a "land parcel" or "plot." It can vary in size and shape, serving various purposes such as residential, agricultural, or commercial use. These extensions may be part of a larger property or stand alone, and they can impact local development and land use planning.
A small section of land is a spit (sand spit). A narrow peninsula may be called a cape. *************************** A 'Headland' is another name.
The extension of land is called a panhandle.
A strait.
Cape
A small one is called an island and a large one is called a continent.
Island
isle
Small areas of land are typically called plots, lots, or parcels. They are usually smaller portions of a larger piece of land that can be used for various purposes such as building a house, growing crops, or as part of a development project.
A small piece of land in the sea is called an island.
Isles
They are called villi. And on their surfaces they have even smaller ones called microvilli.