Alto Mare is a sea-faring city located in the Johto region, and makes its debut in the 5th Movie, Pokémon Heroes. An interesting fact about the city is that its prime mode of transportation is the gondola, which travels through the waterways of the city. Alto Mare's extensive history states that it is watched over by the Eon Pokémon, Latios and Latias. Alto Mare also holds an annual racing competition, titled the Tour de Alto Mare. In this race, contestants ride water chariots with their Water Pokémon pulling them, with the winner of the race being awarded a medal embossed with the Eon Pokémon. The Alto Mare Museum, which is operated by Lorenzo and his granddaughter Bianca is home to a large variety of ancient artefacts, most notably the Defense Mechanism of Alto Mare. It also has the fossilized skeleton of Aerodactyl and Kabutops. The hidden garden located near the Museum contains Alto Mare's crown jewel: the Soul Dew. It is also the hiding place of the Eon Pokémon, who are protected by the family of the Museum's caretakers. The Soul Dew can also power the Defense Mechanism, but as a side-effect will cause all of the water to drain from Alto Mare.
- Alto Mare is Italian for "High Seas" or "Heaven/Sky and Sea".
- Alto Mare's design bears many parallels to the real world city of Venice in Italy, a town which uses gondolas to move around.
- The cuisine within Alto Mare is highly reflective of Italian foods, such as spaghetti.
- The motif of the flood seen in the movie is possibly the "Aqua Alta".
- Identity of the "monster" mentioned in the "folklore" is unknown. The reason why it attacked the city, and what happened after the incident are also undescribed.
- This "monster" could or could not be described with the flood, as there is a portion that matches with actual situation of Venice's subsidence which is in progress.
- On the other hand, there is another possibility that "the unknown being that has the shape of a human arm and is attached with the DMA" which was seen in the earlier trailer, was a draft of the identity of the monster.
- Alto Mare appears in the opening sequence of Hoopa and the Clash of Ages, along with Latios and Latias.