You are possibly looking for Caldera.
Think it's a batholith. I always get this and a caldera confused.
Crater
I think its called the 'summit' Crater....
A circular depression that forms when a magma chamber empties is called a caldera. It is a large volcanic crater made from the collapse of a volcano's mouth.
You are asking about the mouth.
Vent .
The opening in a volcano is called the mouth.
The opening top of the volcano is called a crater. The super-heated gases and ash billows out of the mouth of hell before the magma erupts out destroying all in its path.
Taal volcano is also a high land form but has a mouth or an opening called a crater
the mouth of the volcano, or caldera.
volcano
The city of Bath, England has a spa that was built into the mouth of a volcano. This volcano/ spa has been around since the days of the Roman Empire in 400 B.C. and is not an active volcano.