What do you call coastal plains in Sanskrit language?

There isn't a single, specific Sanskrit word for "coastal plain" that perfectly captures the concept. However, we can create a phrase by combining existing words:

* समुद्रतटवर्ती मैदान (samudra-tat-varti maidan): This literally translates to "sea-shore-adjacent plain."

* समुद्र (samudra): Sea

* तट (tat): Shore

* वर्ती (varti): Adjacent

* मैदान (maidan): Plain

This phrase accurately describes a coastal plain, though it might be a bit lengthy.

Other possibilities include:

* सागरतटवर्ती मैदान (sagar-tat-varti maidan): This uses the word "सागर (sagar)" for "sea" instead of "समुद्र (samudra)".

* तटीय मैदान (tatiya maidan): This uses "तटीय (tatiya)" which means "coastal" and is more concise.

The best choice will depend on the context and your desired level of formality.