They approached the fabled city surrounded by spiders, the boat rocking slightly on the massive river. Luckily, the river was wide enough where trees were not a worry, they only spanned a very short distance over the water.
One of the guards shot a spider skating quickly towards them, across the water. Spiders were not able to drop down from above but some were still a nuisance apparently.
As they approached the city, Tim saw impenetrable stone walls surrounding it. The city was dome-shaped, with a great amount of water falling down the sloped stone surface.
"But how do we get in?" he asked, and promptly fell off his seat as their boat started to rise up out of the river. His guide, rolling his eyes, continued the levitation spell until they were above the city, where there was a great rounded opening in the ceiling.
It appeared the water was supplied by the river, like some sort of fountain. The spiders were unable to climb the slick, wet stone with so much water flowing across it. Tim noticed a lack of trees above the domed city, probably kept cleared away for safety.
They entered the dome and Tim saw spikes below, with a few impaled spiders. "Some of them can jump" somebody explained, before Tim could could a word out of his opened mouth. They floated down, into an entry way and into the great city, where spider fur coats and web-spun armor were everywhere.