What is no man's land

No Mans Land was the stretch of land between 2 warring countries during WWI. It was the most dangerous stretch of land on the battlefront, and was often full of barbed wire and land mines.

Explanation:

https://spartacus-educational.com/FWWnoman.htm

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

answer: the ocean

explanation: if you map out 30 n and 40 n latitude, you will get the ocean