This study describes and analyzes the Surigaonon language, an ethnic language spoken by people in Surigao del Norte, Surigao del Sur, Agusan del Norte, Agusan del Sur and Davao Oriental. More particularly, this paper describes in details the consonant and vowel sounds, stress, intonation patterns, and morphophonemic processes of the Surigaonon language. The data in this study were gathered from 100 participants of different age groups ranging from 15 to 70 years old. The data gathering was conducted using two methods: written communication and oral communication. In this study, some phonemic changes are described and analyzed. These changes are the results of morphophonemic changes, such as deletion, alternation, and metathesis. Furthermore, the findings of the study reveal that the Surigaonon language consists of 17 consonants with 17 sounds and 3 vowels with 5 sounds. It has also 25 clusters and 4 dipthongs, which are similar to the Cebuano language (Rubrico, 1999). Generally, the Surigaonon language is distinct as compared to other languages in the Visayas and Mindanao because it has its own consonant and vowel sounds, stress, intonation patterns and morphophonemic processes.