A bay.
a part of ocean or lake that extends inland
yes. seas are usually smaller and/or closer to shore. they are sometimes part of the ocean.
a peninsula
Tidal flow
An inlet
A gulf or a bay.
arm of a ocean is a area that is a smaller part of the ocean
part of an ocean that extends into the land larger then a bay
A part of a continent that extends into the ocean is called a peninsula. Peninsulas are landforms that are surrounded by water on three sides and connected to the mainland on one side. Examples include the Arabian Peninsula and the Korean Peninsula.
That would be called a peninsula.
Straight
That would be called a peninsula.