From Chalkida, head towards South Evia. After passing Aliveri, about 10 minutes later, you will encounter a sign pointing to Karystos.

A few meters away, you will come across the village of Krieza. There, you will turn towards Petries - Agioi Apostoloi.

In 15 minutes, you will have reached the village of Agioi Apostoloi. Then, turn left towards Stomio. After 10 minutes, you will encounter a sign for Heromylos, and you have arrived!