The clitoris used to be represented and thought of as a small ‘pea’ like structure, sitting above the urethra (Enright, 2019). It wasn’t until relatively recently when Professor Helen O’Connell fully investigated and modelled the full extent of the clitoris in 1998 (Fyfe, 2018). O’Connell is a Urologist (a type of doctor, who specialises in surgery in areas of the body including the bladder and urethra). She used cadavers to map fully map out the clitoris, demonstrating that it was a much bigger structure. Like this:

It includes structures that are hidden deep to other tissue, such as the corpus cavernosum and the bulbs of the clitoris. As you can see from the diagram the bulbs of the clitoris are very close to the vagina – even more so when a person is aroused, as they become swollen and more erect by blood being diverted to them, just as the penis does (Drake et al. 2010).
There is an excellent and short French cartoon about the structure, function and history of ‘Le Clitoris’- the only organ that is just for pleasure – here.

References:
Drake, R. L., Vogl, A. W. & Mitchell, A. W. M. (2010) Gray’s Anatomy for Students. Second Edition. Canada: Churchill Livingstone Elsevier.
Enright, L. (2019) Vagina a Re-Education. Croydon: Allen & Unwin.
Fyfe, M. (October 2018) Get Clitorate: how a Melbourne doctor is redefining sexuality. The Sunday Morning Herald. Accessed online on 21.03.2019 at [https://www.smh.com.au/lifestyle/health-and-wellness/get-cliterate-how-a-melbourne-doctor-is-redefining-female-sexuality-20181203-p50jvv.html}