Castanhal is a city near the eastern edge of the state of Pará northern Brazil. It is located some 65 km east of the state´s capital Belém and 50 km inland SE of the Bay of Marajo. It is accessed by car or bus via federal highway BR-316 . The climate is tropical rainforest. With a population around 185,000, it is the fifth largest city in the state. coordinates: 1° 18′ S, 47° 55′ WWikipedia
A place in Brazil, Castanhal is an interesting place to visit, given its unique culture, history and character. After your splendid visit to Castanhal, you can proceed to an important near-by city of Belem. So, ideally any vacation planner would recommend you to visit Belem for its bountiful attractions like Estacao Das Docas, Parque Mangal Das Garcas, Basilica De Nossa Senhora De Nazare on your trip to Castanhal. Also, to reach Castanhal, you'll have to take a flight to Belem; so its not really a detour. And even if it is, the city is worth paying at least a quick visit. Popular vacation packages of Castanhal are of 1-2 days.