His reign brought peace and prosperity.

It's difficult to find the Big Dipper.

This park is a place of tranquility.

He took a deep breath to simmer himself down.

This lake is very tranquil, it calms the mind.

This park is known for its tranquility.

She demonstrated her intellect to solve the problem.

This park is always tranquil, making it the perfect place to relax.

His voice had the power to calm the entire room.

He took a deep breath and calmed himself down.