Otočec is a settlement on the left bank of the Krka River in the City Municipality of Novo Mesto in southeastern Slovenia. The area is part of the traditional region of Lower Carniola and is now included in the Southeast Slovenia Statistical Region.

The Urban Municipality of Novo Mesto is a municipality in southeastern Slovenia, close to the border with Croatia. The seat of the municipality is the city of Novo Mesto. The municipality of Novo Mesto is part of the Southeast Slovenia Statistical Region. It borders Croatia.