It was believe to be too shallow for the Naus and Caravelas used by the explorers. Building shallow-water vessels in-situ would be too time-consuming, which multiplies danger during an exploration expedition. It just wasn't cost-effective when compared to simply exploiting the resource-rich coastline.
i figured it out its the Congo river i think
With the discovery that traders could obtain gold from kingdoms along the Gold Coast, interest in West African trade intensified. In 1482, the Portuguese established a fort to protect their interests, but they soon faced stiff competition from other European countries. Although the Portuguese mapped the mouth of the Congo River, they did not try to travel it during their explorations. They had little interest in establishing colonies inland.
Portuguese King John II
Magelan
Lateen Sails
The Portuguese were the first to sail directly from Europe to India, while the Spanish were the first to sail directly to the Caribbean.
He was a ninja and didnt sail
Amerigo Vespucci did sail for the Portuguese.
No you can not sail from the Ohio River to the South Carolina coast.
in Africa
The Caravel.
Portuguese designed better ships called caravels. This was done by the Portuguese to help them sail across rough seas.