Go to the icy section of the world map and locate a ramp that zig-zags upwards. A balloon is frozen in an ice block at the top. Drag the frozen balloon down the ramp and the warm river water will melt the ice.

On the left side of the ocean section of the world map you will encounter a monolithic henge of stones. Click on the stone henge and proceed to draw a balloon shape that touches all the stones. The image you render should resemble what the shape of the balloon looks like.