90 days, 1,000 miles, 3 countries, 2 rivers, 31 adventurers, 100% open data. Listen to field recordings, interviews and more from the beating heart of our planet - The Okavango. #Okavango15 is a National Geographic supported expedition to explore the Okavango River system from source to sand. Join us in real-time as we explore one of the world's last pristine river systems.