To the south, Anglia is separated from the neighbouring peninsula of Swania (Ger. "Schwansen", Dan. "Svans" or "Svansø") by the Sly Firth (Ger. "Schlei", Dan. "Sli"), and to the north from the Danish peninsula of Sundeved (Ger. "Sundewitt") and the Danish island of Als (Ger. "Alsen") by the Flensburg Firth (Ger. "Flensburger Förde", Dan. "Flensborg Fjord"). The landscape is hilly, dotted with numerous lakes. Whether ancient Anglia conformed to the borders of the Anglian Peninsula is uncertain. It may have been somewhat larger; however, the ancient sources mainly concur that it also included the peninsula's territory.