Question: The Lötschenlücke connects the Lötschental to the valley of a glacier with a length of about what in 2014?
Sentence (from "Aletsch Glacier"): It has a length of about 23 km (2014), has about a volume of 15.4 km3 (2011), and covers about 81.7 km2 (2011) in the eastern Bernese Alps in the Swiss canton of Valais.
Relevant evidence: Yes