Can you tell a mountain just by looking at it? Do you know your Snowdons from your Tryfans and your Bowfells from your Helvellyns?
Now's your chance to prove your eagle eye in our latest Sigg Tuesday Quiz.
And 10 more Swiss Quality 1.0litre Sigg bottles are up for grabs for those who take on our prize question after completing the quiz. Get it right and your name goes in the hat for one of the 10 prizes.
Made from one piece of aluminium and with no seams, the Sigg bottle is lightweight and virtually unbreakable.
Click the link in the quiz to submit your answer OR email it to email@example.com, with the subject 'Quiz competition w/c 21/10'. Don't forget to include your username!