a column of rock that rises from the floor of a cave [noun]

something with a tall, narrow shape

a feeling of calm and peace [noun]

To try doing something for the first time

Live [verb]

Participants use tyre inner tubes as rafts and ride them on rivers through caves.

a small rubber or plastic boat that can be filled with air [noun]

The activity of riding on a raft over rough, dangerous parts of a fast-flowing river.

Easy [adjective]

white material that collects inside water pipes, kettles, etc. in areas where the water is hard (= contains a lot of natural chemicals) [noun]

Covering a large area [adjective]

An activity that takes place in caves.