Ytre Øydnavatnet is a lake in the municipality of Lyngdal in Agder county, Norway.[1] The 3.22-square-kilometre (1.24 sq mi) lake is located along the river Audna, just south of the lake Øvre Øydnavatnet. The lake sits at an elevation of 96 metres (315 ft) above sea level. The 17.5-kilometre (10.9 mi) long lake lies about 5.5 kilometres (3.4 mi) south of the village of Byremo and about 3.6 kilometres (2.2 mi) north of the village of Konsmo.