Final answer:
Helgoland is a small German archipelago located in the North Sea. It is known for its distinct red sandstone cliffs and rich biodiversity. The main island is Helgoland and the smaller one is Düne.
Step-by-step explanation:
The country that has Helgoland, a small archipelago, in Helgolander Bay is Germany. Helgoland is situated in the North Sea. While the excerpt provided refers to the exploration of what is called Helluland by Norse explorers, which translates to 'the land of flat rocks', it isn't directly related to Helgoland in Germany. The archipelago of Helgoland consists of two islands, the main island known as 'Helgoland' and the smaller one known as 'Düne'. It's known for its unique red sandstone cliffs and rich biodiversity, including various species of seabirds.