Down to the sea with French artist Henry Mosny, a 19th century painter who mostly painted the seashore.

"Fisherman's family in the Côte d'Opale." 1885.
“Fisherman’s family in the Côte d’Opale.” 1885. Oil on canvas. Signed and dated “HMosny 1885”. Image © HAMPEL Fine Art Auctions Munich. Fair use license. via https://www.hampel-auctions.com/a/Henry-Mosny-Maler-des-19-Jahrhunderts.html?a=99&s=417&id=524444&q=9742&kid=9742&qa=
Untitled work. 1888. Oil on panel.
Untitled work. 1888. Oil on panel. Signed and dated on the lower right. Image © Fine Art Auctions Paris (FAAP). Fair use license. via http://auctionsparis.com/html/fiche.jsp?id=9591407&np=&lng=fr&npp=150&ordre=&aff=&r=
Featured

Landscapes by American painter Dwight William Tryon (1849-1925). Various collections. Mostly with trees, one with just water.

"Morning." Undated.
“Morning.” Undated. Image courtesy Peabody Institute. In the public domain due to age. via http://www.urbanartantiques.com/2009/dwight-william-tryon-and-his-early-spring/
"After Sunset looking East." 1915. Painting.
“After Sunset looking East.” 1915. Painting. In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:After_sunset_looking_east_dwight_william_tryon.jpeg
"Apple Blossoms." ca. 1895.
“Apple Blossoms.” ca. 1895. Painting. Signed D W Tryon 1805″ on the bottom right. Uploaded by and collection of the Brooklyn Museum. In the public domain in the United States because it was published before January 1, 1924. via https://commons.wikimedia.org/wiki/File:Brooklyn_Museum_-_Apple_Blossoms_-_Dwight_William_Tryon_-_overall.jpg
"Before Sunrise, June 1905." 1905.
“Before Sunrise, June.” 1905. Oil on canvas. Image © 2019 Detroit Institute of Arts. Fair use license. via https://www.dia.org/art/collection/object/sunrise-june-63762

Down to sail the seven seas with artist John Erik Christian Petersen (1839-1874). Born in Denmark, he mostly painted in America.

"View of Forty Steps Beach, Nahant."  ca. 1870.
“View of Forty Steps Beach, Nahant.” ca. 1870. Collection of the Nahant Historical Society. In the public domain due to age. via http://myweb.northshore.edu/users/ccarlsen/poetry/nahant/image_pages/view_of_forty_steps_beach_painting.html
"Rescue After Storm." 1869.
“Rescue After Storm.” 1869. Oil on canvas. Inscribed “”John E.C. Peterson (sic) pinxit, MDCCCLXIX”. Image © 1999 – 2019 SKINNER, INC. Fair use license. via https://www.skinnerinc.com/auctions/2371/lots/304
"Ship Orozimbo H. L. Townsend Master. off Key West Florida, Sept. 10th 1860." 19th c.
“Ship Orozimbo H. L. Townsend Master. off Key West Florida, Sept. 10th 1860.” 19th c. Oil on canvas. Signed “J. Petersen ” on the lower right. Image © CRN Auctions, Cambridge. Fair use license. via http://www.crnauctions.com/trove/lots/detail/11108/245

Down to the sea back when ships had sails. American. Fitz Henry Lane , artist. Living from 1804 to 1865, he painted and made prints in what later came to be called the Luminism style with its pervasive light.

"Castine Harbor." 1852.
“Castine Harbor.” 1852. Oil on canvas. Collection of the Portland Museum of Art. In the public domain due to age. via http://collections.portlandmuseum.org/Obj5737?sid=182&x=7296&port=1
"Boston Harbor." 1854.
“Boston Harbor.” 1854. Oil on canvas. Collection of the White House, Washington, DC. In the public domain in the United States because it was published or registered before January 1, 1924. via https://commons.wikimedia.org/wiki/File:Fitz_Henry_Lane_-_Boston_Harbor_-_Google_Art_Project.jpg
"Stage Fort across Gloucester Harbor." 1862.
“Stage Fort across Gloucester Harbor.” 1862. Oil on canvas. Collection of the Metropolitan Museum of Art, New York. In the public domain. via https://www.metmuseum.org/art/collection/search/11396

More sailing upon the sea but from a bit back. Some with lighthouses. James Gale Tyler, American painter (1855-1931). So popular was he that even his paintings of dark ships heading home in the dark sold instantly.

"The Steam Yacht 'Stella' of Commodore James Walter Thompson." ca. 1880. Oil on canvas,
“The Steam Yacht ‘Stella’ of Commodore James Walter Thompson.” ca. 1880. Oil on canvas. Signed on the lower right. Image © 2019 Terenchin. Fair use license. via https://www.terenchin.com/2012/09/17/james-gale-tyler-1855-1931/
James-Gale-Tyler-Schooner-Yacht-WATER-WITCH-in-New-York-Harbor-255243-683477
“Schooner Yacht ‘Water Witch’ in New York Harbor.” ca. 1880’s. Image © Incollect.com 2019 and Vallejo Gallery, Newport Beach. Fair use license. via
"Sailboat with Lighthouse at Night." Late 19th c.
“Sailboat with Lighthouse at Night.” Late 19th c. Oil on canvas. Image © 2019 William Doyle Galleries, Inc. Fair use license. via https://doyle.com/auctions/16fd06-doyle-home/catalogue/116-james-gale-tyler
Late 19th c. Watercolor on paper.
Late 19th c. Watercolor on paper. Image 1996 – 2019 © iCollector.com. Fair use license. via https://www.icollector.com/JAMES-GALE-TYLER-American-1855-1931-Watercolor_i30338564

Down by the water and sailing away with seascapes by American painter Warren Sheppard (1858-1937)

"Moon Light Sail." No date.
“Moon Light Sail.” No date. Oil on canvas. Image © 2014 THE BANKS GALLERY, LLC. Fair use license. via http://www.thebanksgallery.com/blog/new-arrival-warren-sheppard
Luminous Seascape with Yachts. No date.
Luminous Seascape with Yachts. No date. Oil on canvas. Image © Hyland Granby Antiques, Hyannisport. Fair use license. via http://www.hylandgranby.com/inventory/luminous-seascape-with-yachts-by-warren-sheppard
View of Venice. No date.
View of Venice. No date. Oil on canvas. Image © 1999 – 2019 SKINNER, INC. Fair use license. via https://m.skinnerinc.com/auctions/2598B/lots/317

Over the water and far away. Marine art by Russian painter Aleksei Vasilievich Hanzen(1876-1937).

"Dubrovnik." ca. 1910.
“Dubrovnik.” ca. 1910. Oil on canvas. Image © 2019 Leighton Fine Art. Fair use license. via https://www.leightonfineart.co.uk/artwork/on-the-black-sea/259203/
"At Dusk."  No date.
“At Dusk.” No date. In the public domain in the United States because the artist has been dead over 70 years. via https://www.reddit.com/r/museum/comments/4h2k87/aleksei_vasilievich_hanzen_18761937_at_dusk/
Coastal scene. No date.
Coastal scene. No date. In the public domain in the United States because the artist has been dead over 70 years. via https://pixels.com/featured/aleksey-vasilievich-hanzen-russian-1876-1937-coastal-scene-aleksei-vasilievich-hanzen.html