Salish Sea Maps for Week 3 & 4 of 2024’s #30DayMapChallenge The prompt for Day 16 of the hashtag#30daymapchallenge is “Choropleth.” Over nine million people live in the Salish Sea Bioregion, but population density varies dramatically over space. Here are the US Census Tracts and Canadian Census Sub-Divisions that had an average 2010/2011 population density of two or fewer people per square kilometer.These very low population density census tracts and subdivisions cover 60% of the land area of our bioregion, but are home to only 0.5% of our population. #30daymapchallengeDay 19’s prompt is “Typography”. Here are the names of large marine water bodies within the Salish Sea oriented and scaled to represent the shape and location of the water bodies themselves. For hashtag#30daymapchallenge Day 22’s prompt of “two colors”, I made this minimalist black and white map of the Salish Sea Bioregion. For #30daymapchallengeDay 23’s prompt of “Memory”, I decided to focus on something the land remembers instead of a human memory. Here is the reconstructed extent of the Cordilleran Ice Sheet ~18,700 years ago (based on Dalton et al. 2020). Winter is coming and the hashtag#30daymapchallenge Day 25’s prompt is “Heat”, so obviously I made a map of the 1991-2020 average winter minimum temperatures across the Salish Sea Bioregion 🙂 How could I resist using a custom Bonne projection for hashtag#30daymapchallenge Day 26’s prompt of “Projections”? So, just for fun, here are 1,000 km interval geodesic buffers around the Salish Sea Bioregion. Does anyone need a Valentine’s Day card for a fan of the Salish Sea? 🙂