It is a part of the municipality of Kaag en Braassem, and lies about 8 kilometres (5.0 miles) northeast of Leiden.

The village of Kaag lies on an island called Kagereiland in the Kager Lakes (Kagerplassen).

To reach De Kaag, a ferry can be taken from Buitenkaag all year or Zevenhuizen in the summer months.

De Kaag is also part of an area called the Duin- en Bollenstreek ("Dune and Bulb Region").

[4] Until the end of the 16th century De Kaag was the largest settlement in the Alkemade area.