The Royal Danish Navy (RDN) (officially Kongelige Danske Marine in Danish but generally known as Søværnet or 'Sea Defence') is the sea-based branch of the Danish Defence force. The RDN is mainly responsible for maritime defence and maintaining the sovereignty of Danish Greenlandic and Faroese territorial waters. Other tasks include surveillance search and rescue icebreaking oil spill recovery and prevention as well as contributions to international tasks and forces.