plain
The Spanish word 'planicie' translates to 'plain' in English. It refers to a large area of flat land with few trees. Typically, it is used in geographical context to describe the landscapes. It may also be used metaphorically in various contexts.
The plain is wide and beautiful.
An observer is describing a geographic feature, in this case, a plain that is both wide and beautiful.
He lived in a small house near the plain.
This sentence is using the past tense, indicating that the person used to live in a small house which was located near a plain.
We can go to the plain to observe the stars.
The sentence suggests a plain as a possible location for stargazing. This is presumably because plains are open and free of light pollution, thus they are ideal places to observe the stars.