Jog Falls is the most famous natural sight in the region and justifies a full day from Shimoga. The Sharavathi river drops 253 metres in four distinct plunges — the Raja, the Rani, the Rover, and the Roarer — over a rocky escarpment at the edge of the Western Ghats. At full flow it is genuinely breathtaking: a curtain of white water crashing into a mist-filled gorge.
The viewpoint on the Karnataka side gives the full panorama; a steep path descends to the base of the falls (about 1,200 steps each way). The Gersoppa Power House viewpoint on the opposite side is less crowded and offers a different angle. The falls are most dramatic from August to November during and after the monsoon — in summer they can reduce to thin threads. Check the Karnataka Power Corporation's release schedule online before going if you're visiting outside the rainy season. The drive from Shimoga (100 km, about 2.5 hours by road through forest roads) is scenic in itself.