The B-10, also known as Ronda Litoral (Catalan: [ˈrondə lituˈɾal], Spanish: [ˈronda litoˈɾal]; English: Coastal Ring Road), is a 20-kilometre (12.43 mi) freeway in Catalonia, Spain partially encircling Barcelona passing through the eastern side of the city. It starts at Nus de la Trinitat interchange in northern Barcelona and runs along the entire length of the Besòs River and the city's coastline south to Nus del Llobregat interchange in Barcelona's southern suburbs, where it becomes the Autovía A-2. Both north and south end interchanges link the freeway to the B-20 or Ronda de Dalt, which encircles Barcelona passing through the western side, jointly forming a beltway commonly referred to as the rondes that surrounds the city.

The freeway features a mix of below-grade, at-grade and covered tunnel sections, mainly as it passes through central Barcelona, where it is only two lanes in each direction while the other sections are three lanes. It becomes a segregated urban highway as it passes through central and northern Barcelona so that all its signposting becomes green and is maintained by the Metropolitan Area of Barcelona. In contrast, the southern section of B-10 is considered to be part of European route E90 and is signposted in blue following the formal colour scheme for motorways since it serves as a continuation of the Autovía A-2. In addition, unlike the rest of the route, this section is named Cinturó Litoral and is maintained by the Spanish Government.

Although the speed limit is 80 km/h (50 mph) along the urban freeway section and 100 km/h (62 mph) along the interurban section, car's average top speed is lower due to traffic congestion as it serves as an arterial corridor to access Barcelona by road, and even average top speed may reach 20 km/h (12 mph) during rush hour. Additional restrictions for heavy goods vehicles are applied on the section situated between Montjuïc–Morrot and Rambla de Prim near Sant Adrià de Besòs, whereby weight limits is posted 12 tonnes and all vehicles over 12 meters long are banned from that section.

Exits on the rondes are numbered 1 to 30 anticlockwise from Nus de la Trinitat according to the beltway that Ronda Litoral (B-10) and Ronda de Dalt (B-20) freeways form around Barcelona so that exits on Ronda de Dalt are officially numbered 1 to 16 (southbound), while on Ronda Litoral are numbered 17 to 30 (northbound). Strangely enough, while the entire urban highway section follows the exit numbering scheme of the rondes, the interurban section that is maintained by the Spanish Government does not and exits on this section are numbered 13 to 19 following its own scheme. In addition, route markers are placed north–south in relation to Nus de la Trinitat, where the road's "Kilometre Zero" is placed, on the contrary of the exits' numbering.

Municipality	km	Mile	Exit	Name	Destinations	Notes
Barcelona–Santa Coloma de Gramenet	0.0	0.0	Nus de la Trinitat
	0.4– 1.0	0.2– 0.6	30	Bon Pastor	Santa Coloma de Gramenet, Potosí Street
Sant Adrià de Besòs	2.2	1.3	29	Verneda	Sant Adrià de Besòs, Guipúscoa Street	Northbound exit is via exit 26 (km 3.8)
	2.7	1.6	28	Gran Via	C-31 south – Plaça de les Glòries Catalanes	No northbound exit
	3.0	1.8	27	Badalona	C-31 north – Badalona, Mataró	Indirect access to Carretera Nacional N-II
	3.8	2.3	26	Sant Adrià	Cristòfol de Moura Street, La Catalana Neighbourhood	Northbound exit only; southbound exit is via exit 29
	3.9	2.4	26	Sant Adrià	La Mina Neighbourhood, La Catalana Neighbourhood, Llull Street	Southbound exit only; northbound exit is via exit 25
	4.3	2.6	24	Diagonal Mar	Rambla de Prim, Passeig de Garcia Fària, Sant Adrià de Besòs	Southbound exit only; northbound exit is via exit 24 named "Besòs"
	4.7	2.9	25	Port Fòrum Sant Adrià	Eduard Maristany Avenue	Northbound exit only; southbound exit is via exit 26 (km 3.9)
Barcelona	6.0	3.7	24	Besòs	Rambla de Prim, Diagonal Mar, Port Fòrum Sant Adrià	Northbound exit; southbound exit is via exit 24 named "Diagonal Mar"
	7.4	4.5	23	Poblenou	Marina, Port Olímpic, Parc del Mar	Northbound exit is via exit 22 (km 9.5)
	7.9	4.9	23	Poblenou	Bac de Roda Street, Avinguda Litoral	No southbound exit
	9.0	5.5	22	Barceloneta	Pla de Palau, Via Laietana, Port Vell
	9.5	5.9	22	Barceloneta	Marina, Port Olímpic, Hospital del Mar, Parc del Mar	Southbound exit is via exit 23 (km 7.4)
	10.7	5.9	21	Ciutat Vella	Paral·lel Street, Ciutat Vella, Port Vell, Estació Marítima Balears	Northbound exit via the other exit numbered 21
	11.0	5.9	20	Port	Port – Mercaderies
	11.6	5.9	21	Ciutat Vella	Paral·lel Street, La Rambla, Montjuïc, Port Vell
	South end of the urban highway section
	13.4	5.9	13		Montjuïc, Passeig de Cantunis, Montjuïc Cemetery, Anella Olímpica
			14		Zona Franca, Mercabarna, Passeig de Zona Franca, Port
			17		C-31 north – Gran Via de les Corts Catalanes Zona Franca, Can Tunis Freight Station
			18B		Zona Franca – 3rd Street
			18A		Zona Franca, Mercabarna, Logistics Area (Z.A.L.)
L'Hospitalet de Llobregat			18		C-31 south – El Prat de Llobregat, Castelldefels, Barcelona–El Prat Airport
			19		B-20 north (Ronda de Dalt) – Barcelona B-20 / C-32 – El Prat de Llobregat, Castelldefels
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access

• Spain portal
• Roads portal
• B-20 motorway (Spain)
• Street names in Barcelona
• Urban planning of Barcelona

Media related to Ronda Litoral at Wikimedia Commons

• Trànsit B-10 on Twitter. Real-time traffic information about B-10 by the Catalan Traffic Agency. (in Catalan)
• Real-time images from traffic cameras installed along Ronda Litoral: Zona Franca · Moll de la Fusta · Badajoz Street · Bon Pastor Neighbourhood
• Northbound driving on Ronda Litoral on YouTube