Hamr na Jezeře is a municipality and village in Česká Lípa District in the Liberec Region of the Czech Republic. It has about 500 inhabitants. I…Hamr na Jezeře is a municipality and village in Česká Lípa District in the Liberec Region of the Czech Republic. It has about 500 inhabitants. It is known as a recreation centre. The name Hamr na Jezeře literally means "hammer mill on Lake".