Having passed through Naivasha town, turn right onto South Lake Road (or left if coming on the lower/escarpment road). 

 

After approx 20 mins, you will pass Sopa Lodge on the right, followed by Longonot Farm.

 

The Kilimandege Sanctuary is the next gate on the right (black gate with a metal vulture on the front and the initials 'JR').

 

If you reach Simba Lodge, you have gone too far!

 

Typing 'Kilimandege Sanctuary, Naivasha' into google maps will also give you the rough location of the gate.