Given the task definition and input, reply with output. In this task, you are given a question. You have to answer the question based on your information.

The Kontek HVDC is a 170 km long,high-voltage direct current cable between Germany and the Danish island Zealand, its name comes from "continent" and the name of the former Danish power transmission company "Elkraft", which operated the power grid on the Danish islands, including Lolland island that is the which largest island of Denmark?
fourth