The country with the most land Boundries is China,with 16 viz Mongolia,Russia,North Korea,Hong Kong,Macau,Vietnam,Laos,Myanmar,India,Bhutan,Nepal,PakistanAfghanistan,Tajikistan,Kyrgyzstan and Kazakhstan.
The country with the largest number of maritime boundaries is Indonasia,with 19.The largest maritime boundry is that between Greenland and Canada at 2697km