The vast/grand/immense Mahakam River, flowing/winding/coursing through the heart/soul/core of Borneo, is a spectacle/marvel/wondrous of nature. This mighty/powerful/impressive waterway carves/cuts/sculpts its way through dense rainforests/jungles/tropical forests, teeming/bursting/overflowing with wildlife. From the grace/elegance/beauty of orangut