Hello Antoine, and welcome to the GEC! Good first post! An old post of mine may interest you. It's an overlay of the USGS "redactions". They used to block out the entire area except the NTS. My overlay matches up nicely with what you have marked. See this post. Again: Gregg _________________________ "Other job markets may lay claim to the title, but astronomy is actually the world's oldest profession." - Phil Plait My Musical Tours . Hubble Showcase Musical Tour . Monument Valley Musical Tour |