Question

a narrow piece of land that connects two large landmasses *
choose
isthmus
peninsula
island
archipelago
river

Explanation:

An isthmus is defined as a narrow strip of land connecting two larger land areas, often with water on either side. A peninsula is a landform surrounded by water on most sides but still attached to a larger landmass. An island is completely surrounded by water. An archipelago is a group of islands. A river is a flowing body of water. Since the description is of a narrow piece of land connecting two large landmasses, the correct term is isthmus.

Answer:

Isthmus