An artificial boundary is a boundary made by humans, examples include dams, the fence at the border between the U.S and Mexico. A natural boundary is a boundary made by nature, a boundary that happens naturally, examples include rivers, mountains and such.
Legends of Chima. Legends of Chima is a CGI animated television series based on the LEGO Legends of Chima series of LEGO sets. It began with 2 episodes airing on January 16, 2013, with the Season 1 finale on December 5, 2013. On March 15, 2014, season 2 premiered on Cartoon Network and ended on November 22, 2014.
If this doesn't work, then the only way for the victim to cancel the Genjutsu is having someone else disrupt his chakra flow with theirs through body contact. It has also been seen that if a person caused themself a shocking pain (such as a stab wound or broken finger) that they will wake up as well.