On the far tip of the Minahasa Peninsula—the finger of land that protrudes north from the Indonesian island of Sulawesi and curves east into the Celebes Sea—rises the 1,110-metre tall volcanic cone of Tangkoko alongside the higher twin peak of Duasaudara, the two brothers. From the edge of the coarse black sand beach to the cloud-covered peaks, dense tropical forest covers these volcanic slopes to form the Tangkoko Batuangas Nature Reserve in the province of Sulawesi Utara, about 60 km