One of the Week 9 Challenges for FortniteBR is to follow the treasure map found in Moisty Mire. Below is an image of the Moisty map, which tells you to look for the house surrounded by trees in a triangles, and to walk North until you reach the house with 2 chimneys.
Circled in red is the house you need to find. It is located South-West of Retail Row. The actual Battle Star is located on top of the chimney.
Other Week 9 Challenges
You have until April 30th to complete your battle pass, so if you need the other challenges for week 9, including the challenges in week 1-8, use the link below.