You can use black paper to add roads, blue construction paper to add bodies of water, and so on. (educationworld.com)
We used green and blue construction paper, a black marker, oil pastels, scissors, and glue. (artforkidshub.com)
Red, Orange, Yellow, Green, Blue, Indigo and Violet Paper Hole Punch 7 Cups or Bowls Glue Kitchen Paper Black Marker Blue Construction Card (rainydaymum.co.uk)