The Office on the Disabled is compiling this ongoing list of popular Saint Louis destinations in order to be a resource for people with disabilities in making informed choices whether they are visitors or residents of Saint Louis. Please note that the current information focuses on physical accessibility.
plural abysses. Learner's definition of ABYSS. [count] : a hole so deep or a space so great that it cannot be measured. the ocean's abysses. I stood at the edge of the cliff and gazed down into the yawning/gaping abyss. [=chasm]
And the word 'plain' usually means a flat, wide area. Put those two things together and you have an abyssal plain, which refers to the huge, flat areas on the ocean floor. Flat is almost an understatement. The abyssal plains are some of the flattest features on the planet. Some drop in elevation less than a foot for every 1,000 feet in distance.