tour around the country; traveling to various provinces
A yojijukugo describing leisurely travel across many regions or provinces, often with a classical or literary flavor.
After retiring, he set off on a journey touring the country.
漫遊 alone means 'wandering' or 'roaming'; 諸国漫遊 specifies roaming across many provinces/countries.
A yojijukugo composed of 諸国 (various countries/provinces) and 漫遊 (wandering/roaming). The exact historical derivation is uncertain.