noun
domestic travel
Travel within one's own country, as opposed to overseas travel (海外旅行).
今年の夏は国内旅行を楽しむつもりです。
I plan to enjoy domestic travel this summer.
海外旅行 means 'overseas travel', contrasting with 国内旅行 which is travel within one's own country.
Compound of 国内 (domestic, within the country) and 旅行 (travel).