Hogenakkel is a waterfall on the Cauvery river lying in Tamil Nadu. The name means smoky rocks in kannada. It is a mighty gorge in to which the Cauvery river jumps in to on its way from Karnataka to Tamil Nadu. Here you can go in circular basket boats(coracle) to go in to the river and the various falls. You can also get freshly fired fish and get your body massaged.
Hogenakkal is best to visit during the post monsoon season. October to February is the best time.
There are only a few hotels at the waterfalls. Dharmapuri is a better option for having food.
Route 1: Bangalore - Hosur - Krishnagiri - Dharmapuri - Hogenakkal.
You can easily reach Dharmapuri from Bangalore in TNSTC buses starting from Mysore road KSRTC bus station or private buses from KR market. From Dharmapuri you will get direct bus to Hogenakkal. You can also go in train till Dharmapuri.