  This is a proceeding of a rapporteur talk given on ground-based gamma-ray
astronomy at the 35th International Cosmic-Ray Conference (ICRC) held in 2017
in Busan, Republic of Korea. A total of ~300 contributions were presented
during the ICRC over 17 gamma-ray sessions. Here, I summarize the contributions
mainly focusing on the source observations performed by ground-based gamma-ray
instruments and the connection between gamma rays and cosmic rays. Any such
summary must necessarily be incomplete. However, I have attempted to provide a
glance into recent progress that has been made in using ground-based gamma-ray
observations to understand the nature of high energy particles in our Universe.
