Guhagar is about 40 kms from Chiplun which is on the NH 17 and is also the nearest railway station. If you are traveling from Mumbai you have the option of using train as the transport mode. Taxis and buses are available at Chiplun connecting one to Guhagar frequently. A bus would roughly take over an hour to reach Guhagar from Chiplun
Mumbai - Mangaon - Mahad - Khed - Chiplun - Guhagar - Abhiruchi
There other alternates however staying on the NH 17 and then the SH 78 is the best option with respect ease of travel.
Pune - Khed Shivapur – Bhor – Varandha Ghat – Mahad - Khed - Chiplun - Guhagar - Abhiruchi
Pune to Guhagar via Bhor is the shortest route however considering ease of travel the better route would be via Patan using the Kumbharli Ghat